IPv4 subnetting worksheet with answers

Free printable IPv4 subnetting worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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Name: ____________________   Date: ____________

1.Easy
255.255.255.19211111111111111111111111111000000network bitshost bits

A subnet has the mask 255.255.255.192. What is its prefix length p?

255.255.255.192
p =
2.Easy
third octet of /22112816413211618140201oneszeros

Write the subnet mask of a /22 network in dotted-decimal notation. What is the value x of its third octet?

/22
x =
3.Medium
/22 → /2511111111111111111111111110000000network bitshost bits

The network 10.92.32.0/22 is divided into equal subnets with prefix /25. How many subnets N are there?

10.92.32.0/22/25
N =
4.Medium
/24 → /2811111111111111111111111111110000network bitshost bits

The network 192.168.10.0/24 must be divided into at least 16 equal subnets. If you borrow as few bits as possible, how many usable hosts H does each subnet have?

192.168.10.0/2416 subnets
H =
5.Hard
last octet = 146112806403211608041201networkhost

A host has the address 10.20.11.146/30. What is the fourth octet x of the last usable host address in its subnet?

10.20.11.146/30
x =
6.Hard
last octet = 158112806403211618141201networkhost

A host has the address 10.20.11.158/26. What is the fourth octet x of the last usable host address in its subnet?

10.20.11.158/26
x =

Answer key

  1. 1. p = 26
  2. 2. x = 252
  3. 3. N = 8
  4. 4. H = 14
  5. 5. x = 146
  6. 6. x = 190

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